Grade 9Inorganic Chemistry
50ml of 0.1M NH4OH ,25ml NH4Cl weere used to make a buffer . what is the PH is if Pkbis 4.8?
50ml of 0.1M NH4OH ,25ml NH4Cl weere used to make a buffer . what is the PH is if Pkbis 4.8?
1 Answer
VEERU YERRAYYA
Approved Tutor Answer13 Years agoThe given buffer is a base buffer
[NH4OH] =[(50*0.1)/75]
[NH4Cl] =[(25*2)/75]
From the principle V1M1=V2M2
For a base buffer pOH = pKb + log [Salt/Base]
Therefore pOH 4.8+ log [{(25*2)/75}/{(50*0.1)/75}] = 4.8+ log (10) = 4.8+1 =5.8
Therefore pH = (14-pOH) = (14-5.8) = 8.2
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